ruby on rails - has_ancestry/ assigning hierarchy to existing table -


i have database imported csv file , assign hierarchy based on assembly level below. not sure approach take. can write if statements long. sorry new this, , don't know begin. appreciated.

assembly_level         assembly_tree           description      uniq_id 0                      0 level               "zero level"    d9s64 1                       level 1 assembly      "level one"     c9633 2                        level 2 assembly     "level two"     11197 3                         level 3 assembly  "level three"   e271f 4                          level 4 assembly  "level four"    552da 4                          level 4 assembly  "level four"    4568a 3                         level 3 assembly  "level three"   b72bd

edit

who can assign assembly_level parent_id during import?

@item = item.new(:assembly_level=> params[:parent_id])


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